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 Title: Absorptions In The Visible Of Protonated Pyrene Collisionally Cooled To 15��k Author(s): Rice, C.A. Contributor(s): Maier, John P.; Gause, Oliver; Hardy, Francois Xavier Subject(s): Mini-symposium: Beyond the Mass-to-Charge Ratio: Spectroscopic Probes of the Structures of Ions Abstract: Protonated polycyclic hydrocarbons have been added to the list of suggested carriers of the diffuse interstellar absorptions. To test this proposition requires laboratory spectra measured under interstellar conditions, in particular with the rotational and vibrational degrees of freedom equilibrated to low temperatures. This has been achieved for protonated pyrene with absorption bands in the visible, using an ion trap and collisional cooling to $\approx$\,15\,K. A two-photon excitation-dissociation scheme was employed to record the (1)\,$^1$A$'~\leftarrow~X\,^1$A$'$ electronic spectrum on around 10$^5$ ions per duty cycle. The origin band of the absorption spectrum of this relatively large polycyclic aromatic species with 27 atoms is located at 4858.86\,\AA. Two further comparably intense spectral features are present at 4834.48 and 4809.32\,\AA. This is one of the largest protonated aromatics studied in the gas phase and compared to astonomical observations; however, it is not a carrier of known diffuse interstellar bands. Issue Date: 2014-06-18 Publisher: International Symposium on Molecular Spectroscopy Citation Info: Rice, C.A.; Maier, J.P.; Gause, O.; Hardy, F.X. ABSORPTIONS IN THE VISIBLE OF PROTONATED PYRENE COLLISIONALLY COOLED TO 15 K. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.WG04 Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/50872 DOI: 10.15278/isms.2014.WG04 Rights Information: Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/ Date Available in IDEALS: 2014-09-172015-04-14
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